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  1. granthendrickson

    Spark plug

    I’m running headers so it couldn’t be the butterfly on the old manifold. I will check for a leak in a minute, the sound goes away when it’s off idle.
  2. granthendrickson

    Spark plug

    Something that I stupidly left out of the post is that the right side idle mixture screw is wollowed out and isn’t able to lean out.
  3. granthendrickson

    Spark plug

    Okay thanks, will do. Do you know why only half the plug looks brown and the other half is white?
  4. granthendrickson

    Spark plug

    Has anyone seen this on a plug? If so what is causing it? Engine is a 355 with 3,000 miles and is running rich. It makes what I think it’s a knock sound coming through the exhaust. All the plugs on the right side of the engine look like this however the left side plugs look normal.
  5. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    She run’s pretty damn well, I rebuilt the engine around 300 miles ago. She’s got a stock bottom end, .30 bore, heads from a 71 camero, new edlebrock intake, 1103 summit cam, headers and a street fire msd distributor
  6. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    Nope I’ve got a avs2 650 cfm edlebrock
  7. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    So the tach is probably just in a six cylinder setting and my rpm at 55 is about where it should be?
  8. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    Awesome thank you for the information!
  9. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    Sounds good I’ll post what I find
  10. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    I got 3 3/4 turns on the driveshaft with two tire revolutions. How do I find out the gear ratio based on that?
  11. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    Sounds good, I’m gonna go get some gear oil and a gasket and change on that while I check the ratio
  12. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    Oddly enough this tach (which I bought on Amazon) advertises it works on 4-6-8 cylinders engines however it doesn’t have any switch to change between them
  13. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    According to this the axle is a 3.73 gear stock axle, how do I go about figuring out wether someone changed the gear ratio?
  14. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    The timing light has a tach on it
  15. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    By a timing light
  16. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    Okay I just drove it on a backroad, she is shifting into third gear. The tach was saying 3,400 rpm at 55 however it is up by around 220 rpm. The speedometer is pretty spot on. So given that info the rpm’s at 55 are close to 3,180.
  17. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    She’s not quite screaming but she’s definitely up there in the rpm according to my ears lol
  18. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    The tach is up by around 220 rpm according to my timing light
  19. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    It’s an aftermarket tach, I’m in McMinnville oregon
  20. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    Whenever I go through town and drive by a speed check thing it looks accurate. But I will try the phone one
  21. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    I’m not 100% sure but that’s what the build sheet says and it looks stock. Last night I was driving and it did go into third gear.
  22. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    Okay, I don’t believe I’m stuck in second but I very well could be if it seems that off
  23. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    Thank you, when my tIres wear out I’ll buy bigger ones lol
  24. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    I’m fairly certain that it is, I can check next time I drive. My tires are about 28 inches
  25. granthendrickson

    74 k10 going 55 mph is at 3,500 rpm

    Y Cool, my tires are stock size and are also brand new so I don’t want to change them out yet

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